Rock speaker



FIG. 1 is a front perspective view of a rock speaker showing my new design;

FIG. 2 is a rear perspective view thereof;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a rear elevational view thereof;

FIG. 5 is a left side elevational view thereof;

FIG. 5 is a right side elevational view thereof;

FIG. 7 is a top plan view thereof; and,

FIG. 8 is a bottom plan view thereof.

The broken lines showing of battery box, solar panel, and the speaker are for illustration and environmental purpose and form no part of the claimed design. 

CLAIM The ornamental design for the rock speaker, as shown and described. 